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Figure 8
A two-dimensional geometric sketch of the Laue condition as used in INSIGHT for GIWAXS indexing and pattern simulation. The Laue condition is fulfilled if the superposition of ki and kf yields the reciprocal-lattice vector Ghkl (intersection of the Ewald sphere and orientation sphere in three dimensions). The involved momentum transfer with respect to the substrate (within the SRF) is q; the x and z components are shown in dark red. αi is the incidence angle and rotates the SRF around the y axis of the LRF.

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